1N6004B Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N6004B is a 15 V, 500 mW Zener diode manufactured by onsemi in DO-35 (DO-204AH) axial through-hole package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for new designs and ongoing production requirements. The 1N6004B operates across a temperature range of -65°C to 200°C with ±5% voltage tolerance and is suitable for voltage regulation and protection applications in electronic circuits.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	15	V
Tolerance	±5%	-
Power - Maximum	500	mW
Impedance (Maximum)	32	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 11 V	-
Voltage - Forward (Maximum) @ If	1.2 V @ 200 mA	-
Operating Temperature Range	-65°C to 200°C	-
Mounting Type	Through Hole	-
Package / Case	DO-204AH, DO-35, Axial	-

Substitute Part Grouping Explanation

Substitution of the 1N6004B is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 15 V nominal
Power dissipation: 500 mW maximum
Voltage tolerance: ±5% or tighter
Package type: DO-35 (DO-204AH) through-hole axial
Mounting configuration: Through-hole

Secondary Compatibility Factors:

Operating temperature range (minimum -65°C to 175°C acceptable for most applications)
Impedance characteristics (maximum 32 Ohms nominal)
Reverse leakage current specifications
Forward voltage characteristics

Substitute parts are grouped into two categories:

Direct Substitutes (15 V, 500 mW, ±5% tolerance): Parts meeting all primary criteria with identical electrical specifications and packaging.

Functional Equivalents (15 V, 500 mW, alternative tolerances): Parts with the same voltage and power ratings but different tolerance grades (±1%, ±2%, ±10%) or slightly modified electrical characteristics that remain functionally compatible within circuit design parameters.

Non-Equivalent Parts: The 1N6005B (16 V) and 1N718 series (250 mW) are listed for reference but do not substitute due to different voltage or power ratings.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Vf (Max) @ If	Temp Range	Status
1N6004B	onsemi	15 V	±5%	500 mW	32 Ω	1.2 V @ 200 mA	-65°C to 200°C	Obsolete
1N5245B	Microchip Technology	15 V	±5%	500 mW	16 Ω	1.5 V @ 200 mA	-65°C to 175°C	Active
BZX79C15	Taiwan Semiconductor Corporation	15 V	±5%	500 mW	30 Ω	1.5 V @ 100 mA	-65°C to 175°C	Active
1N4702 (DO35)	Microsemi Corporation	15 V	±5%	500 mW	-	1.1 V @ 200 mA	-65°C to 175°C	Active
1N5245A (DO-35)	Microsemi Corporation	15 V	±10%	500 mW	16 Ω	1.5 V @ 200 mA	-65°C to 175°C	Active
1N6004C	Microchip Technology	15 V	±2%	500 mW	32 Ω	1.1 V @ 200 mA	-65°C to 175°C	Active
1N6004D	Microchip Technology	15 V	±1%	500 mW	32 Ω	1.1 V @ 200 mA	-65°C to 175°C	Active
TZX15A-TR	Vishay General Semiconductor - Diodes Division	15 V	-	500 mW	40 Ω	1.5 V @ 200 mA	-65°C to 175°C	Active

Engineering Selection Recommendations

Primary Recommendation - Direct Substitutes:

The 1N5245B (Microchip Technology) and BZX79C15 (Taiwan Semiconductor Corporation) are the preferred direct substitutes for the obsolete 1N6004B. Both parts maintain identical 15 V nominal voltage, ±5% tolerance, and 500 mW power rating in DO-35 package configuration. The 1N5245B is currently in active production status with 1375 units in stock. The BZX79C15 offers ROHS3 compliance and is available in Tape & Reel packaging with 4600 units in stock.

Secondary Recommendations - Functional Equivalents:

The 1N6004C and 1N6004D (both Microchip Technology) provide tighter tolerance specifications (±2% and ±1% respectively) while maintaining the same 15 V voltage and 500 mW power rating. These parts are suitable for applications requiring enhanced voltage accuracy. The 1N4702 (Microsemi Corporation) offers comparable electrical performance with active product status.

Compliance Considerations:

The BZX79C15 is ROHS3 compliant, making it suitable for applications subject to RoHS regulations. The 1N5245B and 1N4702 are RoHS non-compliant. All substitute parts maintain REACH Unaffected status and EAR99 export classification consistent with the original 1N6004B.

Temperature Range Limitation:

The original 1N6004B operates to 200°C maximum junction temperature. All active substitute parts operate to 175°C maximum. Applications requiring operation above 175°C cannot use these substitutes and require alternative component selection.

Packaging and Inventory:

The 1N5245B is available in standard bulk packaging with 1375 units in stock. The BZX79C15 is supplied in Tape & Reel format with 4600 units available. The 1N6004C and 1N6004D are available in bulk packaging with 800 and 1052 units respectively.

Frequently Asked Questions (FAQ)

Q: Can the 1N5245B directly replace the 1N6004B in existing circuit designs?

A: Yes. The 1N5245B maintains identical 15 V nominal voltage, ±5% tolerance, and 500 mW power rating in DO-35 package. The primary difference is the maximum operating temperature of 175°C versus 200°C for the original part. Verify that your application does not require operation above 175°C junction temperature.

Q: What is the difference between 1N6004B, 1N6004C, and 1N6004D?

A: These parts are from the same 1N6004 base product family with different voltage tolerance grades. The 1N6004B has ±5% tolerance, 1N6004C has ±2% tolerance, and 1N6004D has ±1% tolerance. All three maintain 15 V nominal voltage and 500 mW power rating. Select based on voltage accuracy requirements of your application.

Q: Is the BZX79C15 compatible with the 1N6004B?

A: Yes. The BZX79C15 is functionally equivalent with 15 V nominal voltage, ±5% tolerance, and 500 mW power rating in DO-35 package. The BZX79C15 offers ROHS3 compliance and is available in Tape & Reel packaging. Impedance is 30 Ohms versus 32 Ohms for the original part, which is within acceptable tolerance for most applications.

Q: Why is the 1N6005B listed but not recommended as a substitute?

A: The 1N6005B has a 16 V nominal voltage rating, not 15 V. This voltage difference makes it unsuitable for circuits designed for 15 V regulation or protection. Use the 1N6005B only in applications specifically requiring 16 V zener voltage.

Q: Can I use the 1N718 series as a substitute?

A: No. The 1N718 series has a maximum power rating of 250 mW, compared to 500 mW for the 1N6004B. This reduced power capacity makes it unsuitable for applications requiring 500 mW dissipation capability.

Q: What is the significance of the TZX15A-TR designation?

A: The TZX15A-TR is a 15 V, 500 mW zener diode from Vishay in Cut Tape packaging with AEC-Q101 automotive qualification. It is suitable for automotive applications but carries a higher impedance specification (40 Ohms) compared to the 1N6004B (32 Ohms). Verify impedance compatibility with your circuit design.

Q: Does packaging format affect electrical performance?

A: No. Packaging format (bulk, Tape & Reel, Cut Tape) does not affect electrical performance. Selection between packaging formats depends on manufacturing process requirements, inventory management, and assembly equipment compatibility. All DO-35 package variants maintain identical electrical specifications.

Q: What compliance certifications should I verify for my application?

A: Verify ROHS compliance status if your application is subject to RoHS regulations. The BZX79C15 is ROHS3 compliant. All substitute parts maintain REACH Unaffected status. Confirm EAR99 export classification is acceptable for your distribution region.

Q: How do I determine which substitute part is best for my circuit?

A: Evaluate based on: (1) Required voltage tolerance (±1%, ±2%, ±5%, or ±10%), (2) Maximum operating temperature requirement (175°C or 200°C), (3) Impedance specifications for your circuit design, (4) Compliance requirements (ROHS, REACH), (5) Packaging format and inventory availability, (6) Supplier lead time and cost considerations.

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